It is all to do with your win/lose strings. Go to edit win/lose strings.
You will see options to choose what is regarded as a win for back staking plans and a seperate option to choose what is regarded as a win for lay staking plans.

You just need to play around with these until you have a setting that will work for both back and lay at the same time.

For instance, If you use are recording the win/lose strings as finishing positions. For the back side - You will want to use "1" as the win/lose string. For the lay side - You will want to use anything BUT "1" as the win/lose string.

If you are like me who has back systems and lay systems in use i just use the same method of results. I use the finishing position. I then set up the "Edit Win/Lose Strings" as explained in my earlier post.

I do it this way so that i can flip from back to lay without changing any settings.

However, you can quite easily use "1" to indicate a winner for BOTH back and lay. It is entirely up to you. In the "Edit Win/Lose String Screen" you would simply make back and lay win strings to be "1".